Experimental investigation of impinging jet flow on a heated curved surface

In turbine blade cooling a relatively cooled air bleeding from the compressor is used as a cooling fluid that allowed higher turbine inlet temperature which increases the turbine effectiveness. Scientists are enhancing flow pattern via changing jet location to enhance heat transfer, reduce pressure drop, and minimize stagnation regions. This study investigates experimentally the heat transfer augmentation and pressure drop due to jet impingement inside a semicircular channel. A side jet configuration with a uniform concave wall heat flux is investigated experimentally. The heat transfer is estimated by calculating the average and local heat transfer coefficient under constant wall heat flux condition and the pumping pressure is estimated by measuring the pressure drop between the inlet and outlet. The measurements include the inlet and outlet flow temperatures using thermocouples, the temperature map of the heated wall using thermal infra-red camera, the flow rates using rotary meter and pressure drop using pressure transducer. The study covers a jet flow Reynolds Numbers of 1000 to 5000. It is found that jet location is having a critical role on heat transfer augmentation.